25920941962646 has 4 divisors (see below), whose sum is σ = 38881412943972. Its totient is φ = 12960470981322.

The previous prime is 25920941962639. The next prime is 25920941962733. The reversal of 25920941962646 is 64626914902952.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6480235490660 + ... + 6480235490663.

It is an arithmetic number, because the mean of its divisors is an integer number (9720353235993).

Almost surely, 2^{25920941962646} is an apocalyptic number.

25920941962646 is a deficient number, since it is larger than the sum of its proper divisors (12960470981326).

25920941962646 is a wasteful number, since it uses less digits than its factorization.

25920941962646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960470981325.

The product of its (nonzero) digits is 100776960, while the sum is 65.

The spelling of 25920941962646 in words is "twenty-five trillion, nine hundred twenty billion, nine hundred forty-one million, nine hundred sixty-two thousand, six hundred forty-six".